Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
theo hieu » theo chieu, theo tieu, thien hieu
hieu lang » chieu sang, hieu quang, nhieu tang
cong manh » cong danh, duong manh, cong thanh
dung cua » dung luan, dung cho
toan cau » toan cao, toan tap, toan tai
toan ban » van ban
ban cua » ban quan

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: theo hieu lang - hanh ((ban cua) or (dung cua)) nhung cong manh ((toan cau) OR (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo hieu lang - hanh ((ban cua) OR (dung cua)) nhung cong manh ((toan cau) OR (toan ban)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo hieu lang - hanh ((ban cua) or (dung cua)) nhung cong manh ((toan cau) OR (toan ban))".
• Adding a wildcard symbol may retrieve word variants: theo hieu lang - hanh ((ban cua) or (dung cua)) nhung cong manh ((toan cau) OR (toan ban))*.